using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.IO;
using System.Windows.Forms;

namespace demo.ClassHelper.DgvOperate
{
    class DgvHelper
    {
        public static bool DataGridViewToCsv(DataGridView dataGridView)
        {
            if (dataGridView.Rows.Count == 0)
            {
                MessageBox.Show("没有数据可导出!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return false;
            }
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.Filter = "CSV files (*.csv)|*.csv";
            saveFileDialog.FilterIndex = 0;
            saveFileDialog.RestoreDirectory = true;
            saveFileDialog.CreatePrompt = true;
            saveFileDialog.FileName = null;
            saveFileDialog.Title = "保存";
            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                Stream stream = saveFileDialog.OpenFile();
                StreamWriter sw = new StreamWriter(stream, System.Text.Encoding.GetEncoding(-0));
                string strLine = "";
                try
                {
                    //表头
                    for (int i = 0; i < dataGridView.ColumnCount; i++)
                    {
                        if (i > 0)
                            strLine += ",";
                        strLine += dataGridView.Columns[i].HeaderText;
                    }
                    strLine.Remove(strLine.Length - 1);
                    sw.WriteLine(strLine);
                    strLine = "";
                    //表的内容
                    for (int j = 0; j < dataGridView.Rows.Count; j++)
                    {
                        strLine = "";
                        int colCount = dataGridView.Columns.Count;
                        for (int k = 0; k < colCount; k++)
                        {
                            if (k > 0 && k < colCount)
                                strLine += ",";
                            if (dataGridView.Rows[j].Cells[k].Value == null)
                                strLine += "";
                            else
                            {
                                string cell = dataGridView.Rows[j].Cells[k].Value.ToString().Trim();
                                //防止里面含有特殊符号
                                cell = cell.Replace("\"", "\"\"");
                                cell = "\"" + cell + "\"";
                                strLine += cell;
                            }
                        }
                        sw.WriteLine(strLine);
                    }
                    sw.Close();
                    stream.Close();
                    MessageBox.Show("数据被导出到：" + saveFileDialog.FileName.ToString(), "导出完毕", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "导出错误", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    return false;
                }
            }
            return true;
        }

        //public static void DgvToExcel(DataGridView dgv, string path)
        //{
        //    string fileName = "";
        //    string saveFileName = "";
        //    SaveFileDialog saveDialog = new SaveFileDialog();
        //    saveDialog.InitialDirectory = path;
        //    if (!Directory.Exists(@saveDialog.InitialDirectory))
        //    {
        //        Directory.CreateDirectory(@saveDialog.InitialDirectory);
        //    }
        //    saveDialog.FileName = DateTime.Now.ToString("yyyyMMdd");
        //    saveDialog.DefaultExt = "xlsx";
        //    saveDialog.Filter = "Excel文件|*.xlsx";
        //    saveDialog.ShowDialog();
        //    saveFileName = saveDialog.FileName;
        //    if (saveFileName.IndexOf(":") < 0) return; //被点了取消
        //    Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
        //    if (xlApp == null)
        //    {
        //        MessageBox.Show("无法创建Excel对象，您的电脑可能未安装Excel");
        //        return;
        //    }
        //    Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
        //    Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
        //    Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1 
        //    //写入标题             
        //    for (int i = 0; i < dgv.ColumnCount; i++)
        //    { worksheet.Cells[1, i + 1] = dgv.Columns[i].HeaderText; }
        //    //写入数值
        //    for (int r = 0; r < dgv.Rows.Count; r++)
        //    {
        //        for (int i = 0; i < dgv.ColumnCount; i++)
        //        {
        //            worksheet.Cells[r + 2, i + 1] = dgv.Rows[r].Cells[i].Value;
        //        }
        //        System.Windows.Forms.Application.DoEvents();
        //    }
        //    worksheet.Columns.EntireColumn.AutoFit();//列宽自适应
        //    MessageBox.Show(fileName + "资料保存成功", "提示", MessageBoxButtons.OK);
        //    if (saveFileName != "")
        //    {
        //        try
        //        {
        //            workbook.Saved = true;
        //            workbook.SaveCopyAs(saveFileName);  //fileSaved = true;                 
        //        }
        //        catch (Exception ex)
        //        {//fileSaved = false;                      
        //            MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);
        //        }
        //    }
        //    xlApp.Quit();
        //    GC.Collect();//强行销毁   
        //}
    }
}